tag	line	file	source code
send_fin	1569	net/ipv4/tcp.c	int send_fin=0;
send_fin	1577	net/ipv4/tcp.c	send_fin=1;
send_fin	1590	net/ipv4/tcp.c	send_fin=1;
send_fin	1613	net/ipv4/tcp.c	return send_fin;